1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #include <acpi/acpi_device.h>
4 #include <acpi/acpigen.h>
5 #include <console/console.h>
6 #include <device/i2c_simple.h>
7 #include <device/device.h>
8 #include <stdio.h>
9
10 #include "chip.h"
11
12 #define I2C_SX9310_ACPI_ID "STH9310"
13 #define I2C_SX9310_ACPI_NAME "Semtech SX9310"
14
15 static const char * const i2c_sx9310_resolution[] = {
16 [SX9310_COARSEST] = "coarsest",
17 [SX9310_VERY_COARSE] = "very-coarse",
18 [SX9310_COARSE] = "coarse",
19 [SX9310_MEDIUM_COARSE] = "medium-coarse",
20 [SX9310_MEDIUM] = "medium",
21 [SX9310_FINE] = "fine",
22 [SX9310_VERY_FINE] = "very-fine",
23 [SX9310_FINEST] = "finest",
24 };
25
i2c_sx9310_fill_ssdt(const struct device * dev)26 static void i2c_sx9310_fill_ssdt(const struct device *dev)
27 {
28 struct drivers_i2c_sx9310_config *config = dev->chip_info;
29 const char *scope = acpi_device_scope(dev);
30 struct acpi_i2c i2c = {
31 .address = dev->path.i2c.device,
32 .mode_10bit = dev->path.i2c.mode_10bit,
33 .speed = I2C_SPEED_FAST,
34 .resource = scope,
35 };
36 struct acpi_dp *dsd;
37 struct acpi_dp *combined_sensors;
38
39 if (!scope || !config)
40 return;
41
42 if (config->speed)
43 i2c.speed = config->speed;
44
45 /* Device */
46 acpigen_write_scope(scope);
47 acpigen_write_device(acpi_device_name(dev));
48 acpigen_write_name_string("_HID", I2C_SX9310_ACPI_ID);
49 acpigen_write_name_integer("_UID", config->uid);
50 acpigen_write_name_string("_DDN", config->desc);
51 acpigen_write_STA(ACPI_STATUS_DEVICE_HIDDEN_ON);
52
53 /* Resources */
54 acpigen_write_name("_CRS");
55 acpigen_write_resourcetemplate_header();
56 acpi_device_write_i2c(&i2c);
57
58 if (config->irq_gpio.pin_count)
59 acpi_device_write_gpio(&config->irq_gpio);
60 else
61 acpi_device_write_interrupt(&config->irq);
62
63 acpigen_write_resourcetemplate_footer();
64
65 /* DSD */
66 dsd = acpi_dp_new_table("_DSD");
67
68 /*
69 * Format describe in linux kernel documentation. See
70 * https://www.kernel.org/doc/Documentation/devicetree/bindings/iio/proximity/semtech%2Csx9310.yaml
71 */
72 acpi_dp_add_integer(dsd, "semtech,cs0-ground", config->cs0_ground);
73 acpi_dp_add_integer(dsd, "semtech,startup-sensor",
74 config->startup_sensor);
75 acpi_dp_add_integer(dsd, "semtech,proxraw-strength",
76 config->proxraw_strength);
77 acpi_dp_add_integer(dsd, "semtech,avg-pos-strength",
78 config->avg_pos_strength);
79
80 /* Add combined_sensors package */
81 if (config->combined_sensors_count > 0) {
82 combined_sensors = acpi_dp_new_table("semtech,combined-sensors");
83 for (int i = 0;
84 i < config->combined_sensors_count &&
85 i < MAX_COMBINED_SENSORS_ENTRIES; ++i) {
86 acpi_dp_add_integer(combined_sensors, NULL,
87 config->combined_sensors[i]);
88 }
89 acpi_dp_add_array(dsd, combined_sensors);
90 }
91 if (config->resolution && config->resolution < ARRAY_SIZE(i2c_sx9310_resolution))
92 acpi_dp_add_string(dsd, "semtech,resolution",
93 i2c_sx9310_resolution[config->resolution]);
94
95 acpi_dp_write(dsd);
96 acpigen_pop_len(); /* Device */
97 acpigen_pop_len(); /* Scope */
98
99 printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev),
100 config->desc ? : dev->chip_ops->name, dev_path(dev));
101 }
102
i2c_sx9310_acpi_name(const struct device * dev)103 static const char *i2c_sx9310_acpi_name(const struct device *dev)
104 {
105 static char name[5];
106
107 snprintf(name, sizeof(name), "D%03.3X", dev->path.i2c.device);
108 return name;
109 }
110
111 static struct device_operations i2c_sx9310_ops = {
112 .read_resources = noop_read_resources,
113 .set_resources = noop_set_resources,
114 .acpi_name = i2c_sx9310_acpi_name,
115 .acpi_fill_ssdt = i2c_sx9310_fill_ssdt,
116 };
117
i2c_sx9310_enable(struct device * dev)118 static void i2c_sx9310_enable(struct device *dev)
119 {
120 struct drivers_i2c_sx9310_config *config = dev->chip_info;
121
122 if (!config) {
123 dev->enabled = 0;
124 return;
125 }
126
127 dev->ops = &i2c_sx9310_ops;
128
129 if (config->desc)
130 dev->name = config->desc;
131 }
132
133 struct chip_operations drivers_i2c_sx9310_ops = {
134 .name = I2C_SX9310_ACPI_NAME,
135 .enable_dev = i2c_sx9310_enable
136 };
137